You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
108 lines
2.2 KiB
108 lines
2.2 KiB
// Copyright (C) MongoDB, Inc. 2017-present. |
|
// |
|
// Licensed under the Apache License, Version 2.0 (the "License"); you may |
|
// not use this file except in compliance with the License. You may obtain |
|
// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 |
|
|
|
package bsonrw |
|
|
|
import ( |
|
"fmt" |
|
) |
|
|
|
type mode int |
|
|
|
const ( |
|
_ mode = iota |
|
mTopLevel |
|
mDocument |
|
mArray |
|
mValue |
|
mElement |
|
mCodeWithScope |
|
mSpacer |
|
) |
|
|
|
func (m mode) String() string { |
|
var str string |
|
|
|
switch m { |
|
case mTopLevel: |
|
str = "TopLevel" |
|
case mDocument: |
|
str = "DocumentMode" |
|
case mArray: |
|
str = "ArrayMode" |
|
case mValue: |
|
str = "ValueMode" |
|
case mElement: |
|
str = "ElementMode" |
|
case mCodeWithScope: |
|
str = "CodeWithScopeMode" |
|
case mSpacer: |
|
str = "CodeWithScopeSpacerFrame" |
|
default: |
|
str = "UnknownMode" |
|
} |
|
|
|
return str |
|
} |
|
|
|
func (m mode) TypeString() string { |
|
var str string |
|
|
|
switch m { |
|
case mTopLevel: |
|
str = "TopLevel" |
|
case mDocument: |
|
str = "Document" |
|
case mArray: |
|
str = "Array" |
|
case mValue: |
|
str = "Value" |
|
case mElement: |
|
str = "Element" |
|
case mCodeWithScope: |
|
str = "CodeWithScope" |
|
case mSpacer: |
|
str = "CodeWithScopeSpacer" |
|
default: |
|
str = "Unknown" |
|
} |
|
|
|
return str |
|
} |
|
|
|
// TransitionError is an error returned when an invalid progressing a |
|
// ValueReader or ValueWriter state machine occurs. |
|
// If read is false, the error is for writing |
|
type TransitionError struct { |
|
name string |
|
parent mode |
|
current mode |
|
destination mode |
|
modes []mode |
|
action string |
|
} |
|
|
|
func (te TransitionError) Error() string { |
|
errString := fmt.Sprintf("%s can only %s", te.name, te.action) |
|
if te.destination != mode(0) { |
|
errString = fmt.Sprintf("%s a %s", errString, te.destination.TypeString()) |
|
} |
|
errString = fmt.Sprintf("%s while positioned on a", errString) |
|
for ind, m := range te.modes { |
|
if ind != 0 && len(te.modes) > 2 { |
|
errString = fmt.Sprintf("%s,", errString) |
|
} |
|
if ind == len(te.modes)-1 && len(te.modes) > 1 { |
|
errString = fmt.Sprintf("%s or", errString) |
|
} |
|
errString = fmt.Sprintf("%s %s", errString, m.TypeString()) |
|
} |
|
errString = fmt.Sprintf("%s but is positioned on a %s", errString, te.current.TypeString()) |
|
if te.parent != mode(0) { |
|
errString = fmt.Sprintf("%s with parent %s", errString, te.parent.TypeString()) |
|
} |
|
return errString |
|
}
|
|
|